Wyniki wyszukiwania - BazTech

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Analiza wypełnienia leśnej przestrzeni na podstawie modeli typu CAD

Chirrek M., Strzeliński P., Wencel A., Sugiero D., Węgiel A.

Roczniki Geomatyki

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2008

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T. 6, z. 4

27-34

EN

The filling of forest space should be defined by a set of synthetic indicators describing structural and dynamic features. The utilization of these indicators in forest sciences, such as forest management or forest nurcery could help in research of development processes in forests. This is necessary in planning the activity related to forest management and protection, in particular . to forest regeneration, maintenance and utilization. An attempt to analyze the filling of forest space was taken in 2007. The experimental material was collected from 50 circular test plots located in the community of fertile Carpathian beech forests in lower-mountain zone of Bieszczady National Park. The results of measurements were imported to AutoCAD 2007 software that was used for spatial analyses. The range of works in the field included measurements of many different structural features in all plant layers of the stand. Moreover, on all test plots azimuths of each tree, as well as distance from the center of the plot to all trees from old-tree layer were measured. These measurements were used for spatial analyses of the distribution of trees in forest space. Area of one tree is contained at a range of 7,69.50,00 m2 and on most test plots it did not deviate very much from the average value (18,13 m2). Average space of one tree amounted to 475,17 m3. On plots in the younger development phases, where there were more trees with small dimensions, value of space of one tree amounted to ca. 120 m3. Besides, random spatial type of distribution of trees dominated on most plots (72%) and not many cases pointed at group distribution. In this study, some indicators were suggested to make forest space characteristics possible. Determination of these parameters may serve analyses of the structure of forest space within the stand. In the future, the indicators can provide some important hints in forest silvicultural and management planning. Further research is needed related to spatial analysis in order to create the synthetic indicators describing structural and dynamic features of all types of stands.

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Wykorzystanie technologii naziemnego skaningu laserowego w inwentaryzacji lasu

Chirrek M., Strzeliński P., Wencel A., Zasada M., Zawiła-Niedźwiecki T.

Roczniki Geomatyki

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2007

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T. 5, z. 5

19-24

EN

Terrestrial laser scanning (TLS) is the technology of the last few years. Within wide areas of its application, a big potential has been found for scientific and operational use of this technique to register and measure various characteristic features of forest environment. In Poland, the technology has been applied, among others, within the framework of the research project entitled .Forest inventory based on integration of various different geomatics techniques., commissioned by the General Directorate of State Forests to be implemented in the years 2006.2008. The goal of the project is to select methods of remote data collection suitable for forestry uses and to elaborate a forest inventory method based on selected geomatic techniques, including TLS technology. FARO LS 880 scanner was selected for the project. The main research area consists of sample plots located in the Milicz forest district. Consecutive tests were performed in Sławno, Chojna, Zielonka and Grodzisk forest districts. Tests of various variants of data collection and processing were performed. The obtained results concerning measurement accuracy and the scope of collected data were compared with traditional forest inventory methods.

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Wybrane zdalne metody szacowania biomasy roślinnej w ekosystemach leśnych jako podstawa systemu raportowania bilansu węgla

Chirrek M., Strzeliński P., Wencel A., Zawiła-Niedźwiecki T., Zasada M., Jagodziński A.

Roczniki Geomatyki

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2007

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T. 5, z. 4

7-16

EN

Effects of increasing CO2 content in the atmosphere of Earth have been widely discussed for a long time and found their expression in a form of the .Kyoto Protocol.. The document shows various ways of reducing the CO2 content. Forest management is listed as one of such possibilities. Thus, the important issue arises to monitor carbon amount accumulated or released as a result of forest ecosystem management as well as to predict its changes depending on various scenarios. The importance of this problem persuaded the General Directorate of State Forests to fund a research project entitled .The Carbon balance in biomass of the major forest forming species in Poland.. The goal of the project is to elaborate and validate allometric equations and expansion factors for determining the biomass of forest stands. Methods to assess amount of carbon accumulated in forest ecosystems as well as methods of detecting changes in carbon accumulation and dynamics resulting from various ways of forest management were also to be elaborated. The first stage of the research, planned for years 2007.2010, is to be performed on about 300 sample plots representing different age classes and sites for 8 major forest tree species and 12 species of shrubs. Empirical equations and expansion factors for determining biomass of trees, shrubs, forest floor, and carbon sequestered in stands will be worked out based on direct and indirect measurements of various forest attributes. The valuable element of the project is a possibility of data integration and comparison of various research methods (satellite and airborne imagery, airborne and terrestrial laser scanning, hemispheric images). As a result of the project, also answers to the following questions are expected: What is the influence of LAI, determined with the use of various methods (hemispheric images, airborne and satellite imagery, and airborne and terrestrial laser scanning), on the accuracy of tree biomass and stand carbon balance assessment? What is the role of vegetation indices on tree biomass assessment accuracy? Does the terrestrial laser scanning significantly increase accuracy and precision, and shorten time of tree, stand and forest floor plants. measurements and their biomass assessment?

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Lotniczy skaning laserowy jako źródło danych dla systemu informacji przestrzennej nadleśnictwa

Chirrek M., Wencel A., Strzeliński P., Stereńczak K., Zasada M., Zawiła-Niedźwiecki T.

Roczniki Geomatyki

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2007

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T. 5, z. 3

19-28

EN

In the last decade, among various remote sensing inventory methods based on the LIDAR technology, airborne laser scanning (ALS) gained much popularity. The advantages of this method (integration with high-resolution digital imagery and a possibility of performing an accurate inventory of various forest objects over large area) make it a valuable source of data for GIS systems in Polish State Forests. The quality and usefulness of these data is currently validated within the framework of a few research projects in forest districts (Milicz, Rogów, Chojna, .wieradów and Szklarska Poręba), and financed by the State Forests, the Ministry of Science and Higher Education, and the European InterReg program. The goal of these studies is to elaborate a forest inventory method suitable for preparation of forest management plans. The method should be applicable not only for the assessment of current state of the forest, but also for predicting development of forest resources in the future.

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Automatyzacja waloryzacji funkcji lasu z wykorzystaniem Systemu Informatycznego Lasów Państwowych

Strzeliński P., Chirrek M.

Roczniki Geomatyki

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2006

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T. 4, z. 3

211-218

EN

The paper presents a system based on a computer programme which enables automation of valuation of forest functions. In the work the valuation system prepared in the Forest Management Department of the Agricultural University in Poznań (in the scope of methodical basis) was used. The method is based on three-step division of forest functions (protective, productive and recreational) and on appraisal of selected values on the level of a stand. For the appraisal a point-weight method of valuation was applied. The automation of forest functions valuation enables relatively fast control of correctness of the applied method under conditions of a concrete object (a forest district) and then verification of selected parameters assessing values and functions of the examined area. The appraisal of individual values consists in working on a great number of input data which has been very time-consuming so far. The use of computer techniques (programme preparing) allowed not only to streamline the process itself but also to eliminate potential mistakes. The programme used data from Computer System of the State Forests (SILP) and enabled preparing basic data for the needs of visualization of a forest numerical map. The programme was prepared and tested with the use of the SILP base and the forest numerical map of the forest district .wieradów. The valuation of forest functions for the forest district .wieradów encompassed 5772 stands. It has been proved that there is a relative balance between groups of functions. The group of recreational functions prevails (37.31% of valuated stands). The group of productive functions has slightly lower value . 36.15%. The group of protective functions has the lowest value . 26.53%. The analysis of the division of stands into degrees of multifunctionality showed that forests close to multifunctional constitute 31.11% and multifunctional forests constitute 30.11% of stands. The domination of the group of recreational functions in the area is justified by the fact that the area is very attractive for tourists, relatively easy accessible, with good tourist infrastructure. It occurred that neither the SILP nor the forest numerical map are sufficient source of data for valuation based on the tested method, although they are functioning flawlessly in the Forest District .wieradów. The assumption accepted in the initial stages was verified (It had been assumed that the system may facilitate introduction of principles of forest functions valuations into forest practice and it may contribute to acceleration of development of this aspect of management works). An efficient valuation system demands both wider data base of stands and corrections in the method of evaluation. There is also a need for standardization of data structure in the bases of the SILP (strict standard of the SILP). Such research directions and implementation works enable to use results of valuation for example to fix forest functions, and as a consequence, to form proper productive and protective recommendations. They may also accelerate research on a multifunctional forest model.